210213

Appears in sequences

• Lucky numbers that are decimal concatenations of n with n + 3.at n=20A032653
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (-1, 1, 0), (0, 0, 1), (1, 1, -1)}.at n=12A148438
• Number of n X 4 0..1 arrays with every element unequal to 0, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=15A317811